Influence of Surface Roughness on a Highly Loaded Axial Compressor Stage Performance at Low Reynolds Number

Table 1

Parameters of the 1.5-stage compressor.

Parameter	Design value
Design rotating speed (r/min)	25000
Total pressure ratio	1.72
Number of blades	31/36/59
Tip clearance (mm)	0.2
Hub clearance (mm)	0.15
Inlet chord length (mm)	23
Design tip speed (m/s)	361
Work coefficient	0.46
Inlet hub/tip radius ratio	0.72